Reliability: an overview

Tools Articles

  • Author: Wayne B. Nelson
  • Date: 07 Oct 2013
  • Copyright: 2007 John Wiley & Sons, Ltd

Many products accumulate repeated repairs and repair costs over time. Analysis of such recurrence data requires special statistical models and methods not covered in basic reliability books. This article presents a simple and informative model and plot for analyzing data on numbers or costs of repeated repairs of a random sample of units. The plot is illustrated with transmission repair data from preproduction cars on a track test. This article also presents a method for comparing two such datasets, illustrated with automatic and manual transmissions. Computer programs that calculate and make the plots and comparisons with confidence limits are surveyed.

Source: Wayne B. Nelson, Repair Data, Sets of: How to Graph, Analyze, and Compare, Encyclopedia of Statistics in Quality and Reliability, 2008

For further reference, please also visit 'Sampling in Pharmaceutical and Chemical Industries' by Henrik Melgaard.

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